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Chris Metcalfdd196a22011-05-09 13:28:43 -04001/*
2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 *
14 * Tilera-specific RTC driver.
15 */
16
17#include <linux/module.h>
18#include <linux/device.h>
19#include <linux/rtc.h>
20#include <linux/platform_device.h>
21
22/* Platform device pointer. */
23static struct platform_device *tile_rtc_platform_device;
24
25/*
26 * RTC read routine. Gets time info from RTC chip via hypervisor syscall.
27 */
28static int read_rtc_time(struct device *dev, struct rtc_time *tm)
29{
30 HV_RTCTime hvtm = hv_get_rtc();
31
32 tm->tm_sec = hvtm.tm_sec;
33 tm->tm_min = hvtm.tm_min;
34 tm->tm_hour = hvtm.tm_hour;
35 tm->tm_mday = hvtm.tm_mday;
36 tm->tm_mon = hvtm.tm_mon;
37 tm->tm_year = hvtm.tm_year;
38 tm->tm_wday = 0;
39 tm->tm_yday = 0;
40 tm->tm_isdst = 0;
41
42 if (rtc_valid_tm(tm) < 0)
43 dev_warn(dev, "Read invalid date/time from RTC\n");
44
45 return 0;
46}
47
48/*
49 * RTC write routine. Sends time info to hypervisor via syscall, to be
50 * written to RTC chip.
51 */
52static int set_rtc_time(struct device *dev, struct rtc_time *tm)
53{
54 HV_RTCTime hvtm;
55
56 hvtm.tm_sec = tm->tm_sec;
57 hvtm.tm_min = tm->tm_min;
58 hvtm.tm_hour = tm->tm_hour;
59 hvtm.tm_mday = tm->tm_mday;
60 hvtm.tm_mon = tm->tm_mon;
61 hvtm.tm_year = tm->tm_year;
62
63 hv_set_rtc(hvtm);
64
65 return 0;
66}
67
68/*
69 * RTC read/write ops.
70 */
71static const struct rtc_class_ops tile_rtc_ops = {
72 .read_time = read_rtc_time,
73 .set_time = set_rtc_time,
74};
75
76/*
77 * Device probe routine.
78 */
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -080079static int tile_rtc_probe(struct platform_device *dev)
Chris Metcalfdd196a22011-05-09 13:28:43 -040080{
81 struct rtc_device *rtc;
82
Jingoo Han3a30b262013-04-29 16:19:53 -070083 rtc = devm_rtc_device_register(&dev->dev, "tile",
84 &tile_rtc_ops, THIS_MODULE);
Chris Metcalfdd196a22011-05-09 13:28:43 -040085
86 if (IS_ERR(rtc))
87 return PTR_ERR(rtc);
88
89 platform_set_drvdata(dev, rtc);
90
91 return 0;
92}
93
Chris Metcalfdd196a22011-05-09 13:28:43 -040094static struct platform_driver tile_rtc_platform_driver = {
95 .driver = {
96 .name = "rtc-tile",
Chris Metcalfdd196a22011-05-09 13:28:43 -040097 },
98 .probe = tile_rtc_probe,
Chris Metcalfdd196a22011-05-09 13:28:43 -040099};
100
101/*
102 * Driver init routine.
103 */
104static int __init tile_rtc_driver_init(void)
105{
106 int err;
107
108 err = platform_driver_register(&tile_rtc_platform_driver);
109 if (err)
110 return err;
111
112 tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0);
113 if (tile_rtc_platform_device == NULL) {
114 err = -ENOMEM;
115 goto exit_driver_unregister;
116 }
117
118 err = platform_device_add(tile_rtc_platform_device);
119 if (err)
120 goto exit_device_put;
121
122 return 0;
123
124exit_device_put:
125 platform_device_put(tile_rtc_platform_device);
126
127exit_driver_unregister:
128 platform_driver_unregister(&tile_rtc_platform_driver);
129 return err;
130}
131
132/*
133 * Driver cleanup routine.
134 */
135static void __exit tile_rtc_driver_exit(void)
136{
Wei Yongjun52fbc772013-05-05 01:07:49 -0400137 platform_device_unregister(tile_rtc_platform_device);
Chris Metcalfdd196a22011-05-09 13:28:43 -0400138 platform_driver_unregister(&tile_rtc_platform_driver);
139}
140
141module_init(tile_rtc_driver_init);
142module_exit(tile_rtc_driver_exit);
143
144MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver");
145MODULE_LICENSE("GPL");
146MODULE_ALIAS("platform:rtc-tile");